Just wanted to swing by and give you a hug lingua. I know that tone from your post well from my own experience. There are moments where the stress and the shitness of living with building work, just pile on top of you.
It will get better. You will sort this. The puddle will one day be a beautiful floor. Plumbing can be moved. Fixes will be found.
But none of that is really to the point, because the emotional journey is not the same as the physical, inanimate one of the house. It's really, really tough. At times, it's unbearable. You have to do whatever you can to survive those times - wine, takeaways, getting out of it all for a bit and going somewhere else. No-one who hasn't been through really major building work knows what it's like. Those who have, however, will instantly recognise it!
(A story to cheer you up. My parents are a bit shit at being supportive - understatement alert. Throughout the build they've been just saying 'Hmm' or something really trite whenever I've moaned. Then, they decided to have their kitchen redone. It took a month - one measly month - and it didn't involve that much stress or hassle. They were on their knees. They cried. They locked themselves out of the house and had a panic. They were in a terrible state. I looked at them and thought - Wow, you know what, what we've all gone through, and how we've all coped, is amazing really.
You're all doing great! Chins up, keep at it!